"The Generation and Propagation of Sound" Sound Phenomenon PPT (Class Assignment)

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"The Generation and Propagation of Sound" Sound Phenomenon PPT (Class Assignment)

Part One: Consolidation of Standards

1. Fill in the blanks

1. Sprinkle some shredded paper on the drum head, tap the drum head to make a sound, and notice that the paper scraps jump. This experiment was used to explore __________. The ________ is vibrating in the experiment, it is called ________.

2. We call ___________ objects as sound sources, and _________, ___________ and ___________ can all be used as sound sources. The lyrics of "Yellow River Cantata" include "The wind is roaring, the horses are braying, and the Yellow River is roaring." The sound sources of "roar", "cry" and "roar" here are _______, _____________, and ____________ respectively.

3． The transmission of sound must rely on ________. The electronic sound generator placed in the water emits sound waves that can lure distant fish into the fishing net, which illustrates ____________________; ancient Chinese doctors used the "suspended thread pulse diagnosis" method to diagnose patients, which illustrates ____________________; there is no air on the moon, two The two astronauts who landed on the moon had to use radio to communicate even if they were very close to each other. This illustrates __________________.

4. The speed of sound in some media is shown in the table below. The unit of sound speed in the table is m/s.

It can be seen from the information in the table: Under normal circumstances, the propagation speed of sound in gas is _________ than the propagation speed in liquid, and the propagation speed of sound in solid is _________ than the propagation speed in liquid. The information in the table shows that the speed of sound depends on the type of medium and _________.

5. The propagation speed of sound in air at 15°C is ________m/s. The echo reaches the human ear more than 0.1 s later than the original sound, so that the human ear can distinguish the echo from the original sound; standing in front of a cliff, to be able to distinguish your own shout from the echo, you must be at least ________m away from the cliff.

2. Multiple choice questions

6. After holding the sounding tuning fork with your hand, the sound stops immediately. This is because ()

A． The vibration of the tuning fork stopped

B. The speed of the sound becomes slower

C. The air no longer carries sound

D. The sound intensity weakens and we can't hear it anymore

7. At the concert, an actor was playing music on a bamboo flute. The flute sounded because ()

A． Actor's lips vibrate to make sounds

B. Bamboo tube vibrates and makes sound

C. The air column in the flute vibrates to produce sound

D. None of the above reasons are correct

8. In the ancient poem "Children's Fishing", there is a line "passers-by ask questions and wave from afar, fearing that the fish will be frightened and not respond." When asked by passers-by, the child just waved but remained silent. From the perspective of sound generation and transmission, the correct one of the following statements is ()

A． Sound can travel through water and scare away fish

B. Answering a passerby's question produces sound waves, but waving does not.

C. Sound can only travel in air, not water

D. When sound waves pass from air to water, their propagation speed remains unchanged.

9. As shown in Figure 5-K-1, it is a "cotton phone" made of two paper cups and a piece of cotton thread. Two people who are far apart can talk through the phone by straightening the cotton thread. This shows that ()

A． Only gas can transmit sound

B. The propagation of sound does not require a medium

C. Solids can carry sound

D. Paper cups can produce sound without vibrating

PPT on the production and dissemination of sound, part 2: innovation and improvement

15. Temperature affects the density of the air. When the temperature is high and the air is relatively sparse, the speed of sound propagation is greater. Therefore, the speed of sound is related to the temperature. As a result, the sound does not necessarily propagate in a straight line from the sound source to the outside. The surface temperature rises rapidly at noon on a sunny day. The temperature near the surface is higher than the temperature in the upper layer. Sound propagates faster near the surface than in the upper layer. Therefore, the sound emitted by the sound source on the ground turns upward when it propagates around. Then try to explore the propagation of sound in the following two scenarios:

(1) When crossing the Lop Nur desert or Gobi Desert in Xinjiang under the scorching red sun, it is difficult for people not too far apart to hear each other’s loud shouts clearly. One of the main reasons is that the sound travels toward ________(optional “top”) ""middle" or "lower") turn.

(2) The ancient Chinese poet Zhang Ji wrote in "Night Mooring at Fengqiao": "Hanshan Temple outside Gusu City, the midnight bell rings to the passenger ship." If the distance from Fengqiao to Hanshan Temple is 680 m, the passengers in the passenger ship The bells heard were produced by monks striking the clock face at least ________s ago (assuming the temperature at that time was 15°C). The surface temperature is ________ (optional "higher" or "lower") than the night sky temperature, the bell turns to ________ (optional "upper", "middle" or "lower"), and the propagation distance is ________ (optional "higher" or "lower") Far", "same" or "nearer").

16． We know that sound travels at different speeds in different media. Read the table below and answer the questions:

The speed of sound in some media (unit: m·s-1)

(1) What are the rules for the propagation speed of sound in media? (Write two items)

(2) When one end of a metal pipe with a length of 884 m is tapped, two sounds are heard at the other end, with an interval of 2.43 s between the two sounds. How fast does sound travel in a metal tube? What material might the metal pipe be made of? (The temperature at this time is about 15 ℃)

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Update Time: 2024-10-02

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